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   <div id="projectname">SSD1306 OLED display driver
   &#160;<span id="projectnumber">1.8.2</span>
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   <div id="projectbrief">This library is developed to control SSD1306/SSD1331/SSD1351/IL9163/PCD8554 RGB i2c/spi LED displays</div>
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<div class="title">ssd1306_uart.c</div>  </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*</span></div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">    MIT License</span></div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">    Copyright (c) 2018, Alexey Dynda</span></div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">    Permission is hereby granted, free of charge, to any person obtaining a copy</span></div><div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">    of this software and associated documentation files (the &quot;Software&quot;), to deal</span></div><div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">    in the Software without restriction, including without limitation the rights</span></div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment">    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span></div><div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment">    copies of the Software, and to permit persons to whom the Software is</span></div><div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment">    furnished to do so, subject to the following conditions:</span></div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment">    The above copyright notice and this permission notice shall be included in all</span></div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment">    copies or substantial portions of the Software.</span></div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment">    THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span></div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment">    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment">    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span></div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment">    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div><div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="comment">    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span></div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="comment">    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE</span></div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment">    SOFTWARE.</span></div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment">*/</span></div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="ssd1306__uart_8h.html">ssd1306_uart.h</a>&quot;</span></div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="preprocessor">#if defined(CONFIG_AVR_UART_AVAILABLE) &amp;&amp; defined(CONFIG_AVR_UART_ENABLE)</span></div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;</div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="keyword">volatile</span> uint8_t g_uart_put_ptr = 0;</div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="keyword">volatile</span> uint8_t g_uart_buf[<a class="code" href="ssd1306__uart_8h.html#adff6f1691b8119f8c50293135a28e1b3">UART_BUFFER_RX</a>];</div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="keyword">static</span> uint8_t s_uart_get_ptr = 0;</div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="keyword">static</span> uint8_t s_uart_interrupt = 0;</div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;</div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="preprocessor">#undef BAUD</span></div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="preprocessor">#define BAUD 115200</span></div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="comment">// We need to define BAUD_TOL too high, because otherwise,</span></div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="comment">// the compiler will give a warning &quot;Baud rate achieved is higher than allowed&quot;</span></div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment">// I would recommend not to use 115200 on atmega328p</span></div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="preprocessor">#define BAUD_TOL 4</span></div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="preprocessor">#include &lt;util/setbaud.h&gt;</span></div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0h_115200 = UBRRH_VALUE;</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0l_115200 = UBRRL_VALUE;</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="preprocessor">#ifdef USE_2X</span></div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_115200 = 1;</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_115200 = 0;</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;</div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="preprocessor">#undef BAUD</span></div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="preprocessor">#define BAUD 57600</span></div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="preprocessor">#include &lt;util/setbaud.h&gt;</span></div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0h_57600 = UBRRH_VALUE;</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0l_57600 = UBRRL_VALUE;</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="preprocessor">#ifdef USE_2X</span></div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_57600 = 1;</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_57600 = 0;</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="preprocessor">#undef BAUD</span></div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="preprocessor">#define BAUD 38400</span></div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="preprocessor">#include &lt;util/setbaud.h&gt;</span></div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0h_38400 = UBRRH_VALUE;</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0l_38400 = UBRRL_VALUE;</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="preprocessor">#ifdef USE_2X</span></div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_38400 = 1;</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_38400 = 0;</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;</div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="preprocessor">#undef BAUD</span></div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;<span class="preprocessor">#define BAUD 19200</span></div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="preprocessor">#include &lt;util/setbaud.h&gt;</span></div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0h_19200 = UBRRH_VALUE;</div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t ubrr0l_19200 = UBRRL_VALUE;</div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;<span class="preprocessor">#ifdef USE_2X</span></div><div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_19200 = 1;</div><div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;<span class="preprocessor">#else</span></div><div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<span class="keyword">static</span> <span class="keyword">const</span> uint8_t u2x0_19200 = 0;</div><div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;</div><div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;<span class="keywordtype">void</span> uart_init_internal(uint32_t baud, uint8_t interrupt)</div><div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;{</div><div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    s_uart_interrupt = interrupt;</div><div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;    <span class="keywordflow">switch</span> (baud)</div><div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;    {</div><div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;        <span class="keywordflow">case</span> 19200:</div><div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;            UBRR0H = ubrr0h_19200;</div><div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;            UBRR0L = ubrr0l_19200;</div><div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;            <span class="keywordflow">if</span> (u2x0_19200) UCSR0A |= _BV(U2X0); <span class="keywordflow">else</span> UCSR0A &amp;= ~(_BV(U2X0));</div><div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;            <span class="keywordflow">break</span>;</div><div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;        <span class="keywordflow">case</span> 38400:</div><div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;            UBRR0H = ubrr0h_38400;</div><div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;            UBRR0L = ubrr0l_38400;</div><div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;            <span class="keywordflow">if</span> (u2x0_38400) UCSR0A |= _BV(U2X0); <span class="keywordflow">else</span> UCSR0A &amp;= ~(_BV(U2X0));</div><div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;            <span class="keywordflow">break</span>;</div><div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;        <span class="keywordflow">case</span> 57600:</div><div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;            UBRR0H = ubrr0h_57600;</div><div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;            UBRR0L = ubrr0l_57600;</div><div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;            <span class="keywordflow">if</span> (u2x0_57600) UCSR0A |= _BV(U2X0); <span class="keywordflow">else</span> UCSR0A &amp;= ~(_BV(U2X0));</div><div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;            <span class="keywordflow">break</span>;</div><div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;        <span class="keywordflow">case</span> 115200:</div><div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;            UBRR0H = ubrr0h_115200;</div><div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;            UBRR0L = ubrr0l_115200;</div><div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;            <span class="keywordflow">if</span> (u2x0_115200) UCSR0A |= _BV(U2X0); <span class="keywordflow">else</span> UCSR0A &amp;= ~(_BV(U2X0));</div><div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;            <span class="keywordflow">break</span>;</div><div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;        <span class="keywordflow">default</span>:</div><div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;            <span class="keywordflow">break</span>;</div><div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;    }</div><div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;    UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); <span class="comment">/* 8-bit data */</span></div><div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;    UCSR0B = _BV(RXEN0) | _BV(TXEN0) | (s_uart_interrupt ? _BV(RXCIE0) : 0);</div><div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;}</div><div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;</div><div class="line"><a name="l00117"></a><span class="lineno"><a class="line" href="ssd1306__uart_8h.html#a0a6add2293e47c6adb4070dcafb77991">  117</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="ssd1306__uart_8h.html#a0a6add2293e47c6adb4070dcafb77991">uart_send_byte</a>(uint8_t c)</div><div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;{</div><div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;    loop_until_bit_is_set(UCSR0A, UDRE0); <span class="comment">/* Wait until data register empty. */</span></div><div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;    UDR0 = c;</div><div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;}</div><div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;</div><div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> uint8_t uart_byte_available_direct(<span class="keywordtype">void</span>)</div><div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;{</div><div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;    <span class="keywordflow">return</span> bit_is_set(UCSR0A, RXC0);</div><div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;}</div><div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;</div><div class="line"><a name="l00128"></a><span class="lineno"><a class="line" href="ssd1306__uart_8h.html#a9303a912df9a76702c17750f3f0a5bf0">  128</a></span>&#160;uint8_t <a class="code" href="ssd1306__uart_8h.html#a9303a912df9a76702c17750f3f0a5bf0">uart_byte_available</a>(<span class="keywordtype">void</span>)</div><div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;{</div><div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;    <span class="keywordflow">if</span> (!s_uart_interrupt)</div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;    {</div><div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;        <span class="keywordflow">while</span> (uart_byte_available_direct()) __uart_read_byte();</div><div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;    }</div><div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;    <span class="keywordflow">return</span> g_uart_put_ptr != s_uart_get_ptr;</div><div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;}</div><div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;</div><div class="line"><a name="l00137"></a><span class="lineno"><a class="line" href="ssd1306__uart_8h.html#a8cd92b6cf3b75bf832242080a7dbe6c2">  137</a></span>&#160;uint8_t <a class="code" href="ssd1306__uart_8h.html#a8cd92b6cf3b75bf832242080a7dbe6c2">uart_read_byte</a>(<span class="keywordtype">void</span>)</div><div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;{</div><div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;    uint8_t data = g_uart_buf[s_uart_get_ptr];</div><div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;    s_uart_get_ptr = (s_uart_get_ptr + 1) &amp; (<a class="code" href="ssd1306__uart_8h.html#adff6f1691b8119f8c50293135a28e1b3">UART_BUFFER_RX</a> - 1);</div><div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;    <span class="keywordflow">return</span> data;</div><div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;}</div><div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;</div><div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;<span class="preprocessor">#endif</span></div><div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;</div><div class="ttc" id="ssd1306__uart_8h_html_adff6f1691b8119f8c50293135a28e1b3"><div class="ttname"><a href="ssd1306__uart_8h.html#adff6f1691b8119f8c50293135a28e1b3">UART_BUFFER_RX</a></div><div class="ttdeci">#define UART_BUFFER_RX</div><div class="ttdef"><b>Definition:</b> <a href="ssd1306__uart_8h_source.html#l00049">ssd1306_uart.h:49</a></div></div>
<div class="ttc" id="ssd1306__uart_8h_html_a8cd92b6cf3b75bf832242080a7dbe6c2"><div class="ttname"><a href="ssd1306__uart_8h.html#a8cd92b6cf3b75bf832242080a7dbe6c2">uart_read_byte</a></div><div class="ttdeci">uint8_t uart_read_byte(void)</div><div class="ttdoc">Reads byte from UART RX buffer. </div><div class="ttdef"><b>Definition:</b> <a href="ssd1306__uart_8c_source.html#l00137">ssd1306_uart.c:137</a></div></div>
<div class="ttc" id="ssd1306__uart_8h_html_a9303a912df9a76702c17750f3f0a5bf0"><div class="ttname"><a href="ssd1306__uart_8h.html#a9303a912df9a76702c17750f3f0a5bf0">uart_byte_available</a></div><div class="ttdeci">uint8_t uart_byte_available(void)</div><div class="ttdoc">Returns non-zero code if there are bytes in RX buffer. </div><div class="ttdef"><b>Definition:</b> <a href="ssd1306__uart_8c_source.html#l00128">ssd1306_uart.c:128</a></div></div>
<div class="ttc" id="ssd1306__uart_8h_html"><div class="ttname"><a href="ssd1306__uart_8h.html">ssd1306_uart.h</a></div></div>
<div class="ttc" id="ssd1306__uart_8h_html_a0a6add2293e47c6adb4070dcafb77991"><div class="ttname"><a href="ssd1306__uart_8h.html#a0a6add2293e47c6adb4070dcafb77991">uart_send_byte</a></div><div class="ttdeci">void uart_send_byte(uint8_t c)</div><div class="ttdoc">Sends single byte over UART. </div><div class="ttdef"><b>Definition:</b> <a href="ssd1306__uart_8c_source.html#l00117">ssd1306_uart.c:117</a></div></div>
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